Interferometric CT measurement of three-dimensional flow phenomena on shock waves and vortices discharged from open ends
Interferometric CT measurement of three-dimensional flow phenomena on shock waves and vortices discharged from open ends
复制标题
干涉CT测量开口端排出的冲击波和涡旋的三维流动现象
DOI：
10.1007/s00193-003-0206-1
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发表时间：
2003
期刊：
影响因子：
2.2
通讯作者：
T. Morioka
中科院分区：
文献类型：
--
作者：
Hiroki Honma;M. Ishihara;T. Yoshimura;K. Maeno;T. Morioka;T. Morioka
利用干涉CT（计算机断层扫描）技术，对从方形开口端和一对圆形开口端排出的激波和涡流进行了三维流动现象的观察。为了获得三维流场的多向有限条纹干涉图，我们在激波管的试验段引入了旋转导管模型。在初始压力为98 kPa的氮气条件下，分别对入射激波马赫数1.50和1.30进行了实验。在规定的精度范围内，通过仔细选择可重复流动的投影图像，可以获得高质量的密度分布CT图像。通过密度分布和等流面伪彩色图像，清晰地显示了涡环、二次激波、激波-涡相互作用和激波-激波相互作用的三维流动特征。讨论了它们在气体动力学和激波动力学中的意义。我们证明，在冲击动力学的各种三维问题的研究是可能使用目前的CT技术。
Three-dimensional flow phenomena are observed in a shock tube experiment for shock waves and vortices discharged from a square open end and a pair of circular open ends by using an interferometric CT (Computed Tomography) technique. To take multidirectional finite-fringe interferograms for a three-dimensional flow field, we introduce a rotating duct model in the test section of the shock tube. The experiments are performed for incident shock Mach numbers 1.50 and 1.30 in nitrogen gas of 98 kPa initial pressure. Good quality CT images of the density distribution are obtained by carefully selecting the projection images for a reproducible flow within a prescribed accuracy. The three-dimensional flow features are clearly visualized for a vortex ring, a secondary shock wave, shock-vortex interaction, and shock-shock interaction through the pseudo-color image of density distribution and the isopycnic surface. Their meanings in gas dynamics and shock dynamics are discussed. We demonstrate that studies of various three-dimensional problems in shock dynamics are possible using the present CT technique.